What is a node's "counter ID?"

[Paul Pollack <pa...@klaviyo.com>]

Hi,

I was reading the doc page for nodetool cleanup
https://docs.datastax.com/en/cassandra/2.1/cassandra/tools/toolsCleanup.html
because I was planning to run it after replacing a node in my counter
cluster and the sentence "Cassandra assigns a new counter ID to the node"
gave me pause. I can't find any other reference to a node's counter ID in
the docs and was wondering if anyone here could shed light on what this
means, and how it would affect the data being stored on a node that had its
counter ID changed?

Thanks,
Paul

Re: What is a node's "counter ID?"

[Paul Pollack <pa...@klaviyo.com>]

Makes sense, thanks Blake!

On Fri, Oct 20, 2017 at 9:17 PM, Blake Eggleston <be...@apple.com>
wrote:

> I believe that’s just referencing a counter implementation detail. If I
> remember correctly, there was a fairly large improvement of the
> implementation of counters in 2.1, and the assignment of the id would
> basically be a format migration.
>
>
> On Oct 20, 2017, at 9:57 AM, Paul Pollack <pa...@klaviyo.com>
> wrote:
>
> Hi,
>
> I was reading the doc page for nodetool cleanup
> https://docs.datastax.com/en/cassandra/2.1/cassandra/tools/
> toolsCleanup.html because I was planning to run it after replacing a node
> in my counter cluster and the sentence "Cassandra assigns a new counter ID
> to the node" gave me pause. I can't find any other reference to a node's
> counter ID in the docs and was wondering if anyone here could shed light on
> what this means, and how it would affect the data being stored on a node
> that had its counter ID changed?
>
> Thanks,
> Paul
>
>

Re: What is a node's "counter ID?"

[Blake Eggleston <be...@apple.com>]

I believe that’s just referencing a counter implementation detail. If I remember correctly, there was a fairly large improvement of the implementation of counters in 2.1, and the assignment of the id would basically be a format migration.

> On Oct 20, 2017, at 9:57 AM, Paul Pollack <pa...@klaviyo.com> wrote:
> 
> Hi,
> 
> I was reading the doc page for nodetool cleanup https://docs.datastax.com/en/cassandra/2.1/cassandra/tools/toolsCleanup.html because I was planning to run it after replacing a node in my counter cluster and the sentence "Cassandra assigns a new counter ID to the node" gave me pause. I can't find any other reference to a node's counter ID in the docs and was wondering if anyone here could shed light on what this means, and how it would affect the data being stored on a node that had its counter ID changed?
> 
> Thanks,
> Paul